A person who jumps into the back of a car to go off campus for lunch with you, but doesn't talk to the driver first.

This type of person also screws up any pre-planned lunches by taking up a seat or “bucket” in the vehicle. This messes up the number of people originally walking to the car by adding an unknown extra person to sneak a ride in the vehicle. Most of the time the driver is too nice and polite to kick the bucket jockey out of the seat, because it is guaranteed to be a socially awkward confrontation. This results in a quiet and uncomfortable car ride to and from lunch. This word was coined by Taylor Carey and other students from Athens Drive High School.